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The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships.The 38-caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun.
A SIG Sauer SSG 3000 bolt action rifle fitted with a Zeiss Victory Diavari 3-12x56 telescopic sight with Zeiss rail.. Zeiss inner rail, [1] generally simply referred to as Zeiss rail, is a ringless scope sight mounting system introduced by Zeiss in 1990 as an alternative to traditional ring mounts. [2]
The latter evolved into the Scarff ring, a rotating ring mount which allowed the gun to be turned to any direction with the gunner remaining directly behind it, the weapon held in an intermediate elevation by bungee cord, a simple and effective mounting for single weapons such as the Lewis Gun though less handy when twin mounted as with the ...
Although it was a seemingly simple device, later attempts to emulate the Scarff ring as a mounting for the dorsal Vickers K in the World War II Handley Page Hampden bomber were failures. Handley Page had designed a carriage with ball-bearing wheels running on a track around the cockpit. Vibration when firing shook the balls out, jamming the ...
It is similar in concept to the earlier commercial Weaver rail mount used to mount telescopic sights, but is taller and has wider slots at regular intervals along the entire length. The MIL-STD-1913 locking slot width is 0.206 in (5.23 mm). The spacing of slot centres is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00 mm). [8]
There are also special ring mounts in the market with circularly shaped ring inserts made to provide stress free mounting without lapping, with Burris Signature Rings and Sako Optilock Rings as two well-known examples. Burris Signature was introduced in 1995. [16] A patent was applied for in 1994, and was granted in 1995. [17]